<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程详情 开始 -->
    <section class="container">
      <section class="path-wrap txtOf hLh30">
        <a href="#" title class="c-999 fsize14">首页</a>
        \
        <a href="#" title class="c-999 fsize14">{{courseWebVo.subjectLevelOne}}</a>
        \
        <span class="c-333 fsize14">{{courseWebVo.subjectLevelTwo}}</span>
      </section>
      <div>
        <article class="c-v-pic-wrap" style="height: 357px;">
          <section class="p-h-video-box" id="videoPlay">
            <img :src="courseWebVo.cover" :alt="courseWebVo.title" class="dis c-v-pic"/>
          </section>
        </article>
        <aside class="c-attr-wrap">
          <section class="ml20 mr15">
            <h2 class="hLh30 txtOf mt15">
              <span class="c-fff fsize24">{{courseWebVo.title}}</span>
            </h2>
            <section class="c-attr-jg">
              <span class="c-fff">价格：</span>
              <b class="c-yellow" style="font-size:24px;">￥{{courseWebVo.price}}</b>
            </section>
            <section class="c-attr-mt c-attr-undis">
              <span class="c-fff fsize14">主讲： {{courseWebVo.teacherName}}&nbsp;&nbsp;&nbsp;</span>
            </section>
            <section class="c-attr-mt of">
              <span class="ml10 vam">
                <em class="icon18 scIcon"></em>
                <a class="c-fff vam" title="收藏" href="#">收藏</a>
              </span>
            </section>
            <section v-if="Number(courseWebVo.price) === 0 || buyCourse" class="c-attr-mt">
              <a href="#" title="立即观看" class="comm-btn c-btn-3">立即观看</a>
            </section>
            <section  v-else class="c-attr-mt">
              <a @click="createOrders()" href="#" title="立即购买" class="comm-btn c-btn-3">立即购买</a>
            </section>
          </section>
        </aside>
        <aside class="thr-attr-box" style="z-index: 0">
          <ol class="thr-attr-ol ">
            <li>
              <p>&nbsp;</p>
              <aside>
                <span class="c-fff f-fM">购买数</span>
                <br/>
                <h6 class="c-fff f-fM mt10">{{courseWebVo.buyCount}}</h6>
              </aside>
            </li>
            <li>
              <p>&nbsp;</p>
              <aside>
                <span class="c-fff f-fM">课时数</span>
                <br/>
                <h6 class="c-fff f-fM mt10">20</h6>
              </aside>
            </li>
            <li>
              <p>&nbsp;</p>
              <aside>
                <span class="c-fff f-fM">浏览数</span>
                <br/>
                <h6 class="c-fff f-fM mt10">501</h6>
              </aside>
            </li>
          </ol>
        </aside>
        <div class="clear"></div>
      </div>
      <!-- /课程封面介绍 -->
      <div class="mt20 c-infor-box">
        <article class="fl col-7">
          <section class="mr30">
            <div class="i-box">
              <div>
                <section id="c-i-tabTitle" class="c-infor-tabTitle c-tab-title">
                  <a name="c-i" class="current" title="课程详情">课程详情</a>
                </section>
              </div>
              <article class="ml10 mr10 pt20">
                <div>
                  <h6 class="c-i-content c-infor-title">
                    <span>课程介绍</span>
                  </h6>
                  <div class="course-txt-body-wrap">
                    <section class="course-txt-body">
                      <p v-html="courseWebVo.description">{{courseWebVo.description}}</p>
                    </section>
                  </div>
                </div>
                <!-- /课程介绍 -->
                <div class="mt50">
                  <h6 class="c-g-content c-infor-title">
                    <span>课程大纲</span>
                  </h6>
                  <section class="mt20">
                    <div class="lh-menu-wrap">
                      <menu id="lh-menu" class="lh-menu mt10 mr10">
                        <ul>
                          <!-- 文件目录 -->
                          <li
                            class="lh-menu-stair"
                            v-for="chapter in chapterVideoList"
                            :key="chapter.id"
                          >
                            <a href="javascript: void(0)" :title="chapter.title" class="current-1">
                              <em class="lh-menu-i-1 icon18 mr10"></em>
                              {{chapter.title}}
                            </a>

                            <ol class="lh-menu-ol" style="display: block;">
                              <li
                                class="lh-menu-second ml30"
                                v-for="video in chapter.children"
                                :key="video.id"
                              >
                                <a :href="'/player/'+video.videoSourceId" target="_blank">
                                  <span class="fr">
                                    <i class="free-icon vam mr10">免费试听</i>
                                  </span>
                                  <em class="lh-menu-i-2 icon16 mr5">&nbsp;</em>
                                  {{video.title}}
                                </a>
                              </li>
                            </ol>
                          </li>
                        </ul>
                      </menu>
                    </div>
                  </section>
                </div>
                <!-- /课程大纲 -->
              </article>
            </div>
          </section>
        </article>
        <aside class="fl col-3">
          <div class="i-box">
            <div>
              <section class="c-infor-tabTitle c-tab-title">
                <a title href="javascript:void(0)">主讲讲师</a>
              </section>
              <section class="stud-act-list">
                <ul style="height: auto;">
                  <li>
                    <div class="u-face">
                      <a href="#">
                        <img :src="courseWebVo.avatar" width="50" height="50" alt/>
                      </a>
                    </div>
                    <section class="hLh30 txtOf">
                      <a class="c-333 fsize16 fl" href="#">{{courseWebVo.teacherName}}</a>
                    </section>
                    <section class="hLh20 txtOf">
                      <span class="c-999">{{courseWebVo.intro}}</span>
                    </section>
                  </li>
                </ul>
              </section>
            </div>
          </div>
        </aside>
        <div class="clear"></div>
      </div>


      <!-- 评论部分开始 -->
      <div class="mt20 c-infor-box">
        <article class="fl col-7 comment-container">
          <section class="mr30">
            <div class="i-box">

              <section class="c-infor-tabTitle c-tab-title">
                <a name="c-i" class="current" title="评论详情">评论详情</a>
              </section>

              <!-- 评论框部分 -->
              <div style="margin-top: 20px;margin-bottom:15px;padding-bottom: 20px;border-bottom: solid 1px #eeeeee">

                <el-input v-model="input" placeholder="输入评论 ~" style="width: 85%"></el-input>
                <el-button type="success" style="width: 12%" @click="releaseComment" plain>发布评论</el-button>
              </div>

              <!-- 评论部分 -->
              <div style="height: auto;border-bottom: solid 1px #eeeeee" v-for="val in commentInfo">
                <!-- 头像部分 -->
                <img style="height: 45px;border-radius:50%;vertical-align: top"
                     :src="val.avatar" alt="头像">


                <div style="margin-left: 50px;margin-top: -45px;padding-bottom: 10px">

                  <!-- 用户昵称 -->
                  <span style="font-size: 16px;font-family:sans-serif;margin-left: 10px;color: #5ac786"> {{val.nickname}} </span>

                  <span style="float: right;margin-right: 20%;color: rgba(184,181,181,0.88)"> {{val.gmtCreate}} </span>
                  <br>

                  <!-- 评论内容 -->
                  <p
                    style="color: rgba(17,17,17,0.78);display:inline-block;font-family:sans-serif;margin-left: 10px;width: 80%;">
                    {{val.content}}
                  </p>
                </div>

              </div>

              <!-- 如果没有评论，就显示这个 -->
              <div style="height: 120px;width: 100px;margin: 0 auto" v-if="commentInfo.length===0">
                <el-empty :image-size="30" description="暂无评论~"></el-empty>

              </div>

              <!-- 分页条部分 -->
              <div style="margin: 20px auto 0;height: 35px;width: 140px;">
                <el-pagination
                  background
                  layout="prev, pager, next"
                  :total="total"
                  :page-size="limit"
                  :current-page="page"
                  @current-change="getCommentInfoById">
                </el-pagination>
              </div>
            </div>
          </section>
        </article>
      </div>
      <!-- /评论结束 -->


    </section>

  </div>
</template>

<script>
  import courseApi from "@/api/course";
  import ordersApi from "@/api/orders";
  import cookie from "js-cookie";

  export default {
    asyncData({params, error}) {
      return {courseId: params.id}
    },
    data() {
      return {
        courseWebVo: {},
        chapterVideoList: [],
        buyCourse: false,
        // 发送评论
        input: "",
        // 评论内容，查询接口后，返回的数据
        commentInfo: [],
        page: 1, // 当前页面
        limit: 4, // 每页条数
        total: 0, // 总记录数
      }
    },
    mounted() {//在页面渲染之前执行
      this.initCourseInfo()
    },
    methods: {
      //查询课程详情信息
      initCourseInfo() {
        courseApi.getCourseInfo(this.courseId)
          .then(response => {
            this.courseWebVo = response.data.courseWebVo;
            this.chapterVideoList = response.data.chapterVideoList;

            this.buyCourse = response.data.buyCourse

            // 获取第一页的评论信息
            this.getCommentInfoById()

          })
      },
      // 获取评论
      getCommentInfoById(page = 1) {
        // 根据课程 id 获取对应评论信息
        courseApi.getCommentInfo(this.page = page, this.limit, this.courseWebVo.id).then(res => {
          this.commentInfo = res.data.list
          this.total = res.data.total
        })
      }
      ,
      // 发布评论
      releaseComment() {
        let obj = {
          courseId: this.courseWebVo.id,
          content: this.input,
          teacherId: this.courseWebVo.teacherId
        }
        if (cookie.get('guli_token')) {
          courseApi.releaseCommentInfo(obj).then(res => {
            this.$message.success("评论成功")
            this.initCourseInfo();
            this.input = ""
          })
        } else {
          this.$message.error("请先登录！")
        }

      },
      //生成订单
      createOrders() {
        ordersApi.createOrders(this.courseId).then(response => {
          //获取返回订单号
          //生成订单之后，跳转订单显示页面
          this.$router.push({path: '/orders/' + response.data.OrderCode});
        });
      }
    }
  };
</script>


<style scoped>
  .comment-container {
    overflow: hidden;
  }
</style>
